Gear pump for use in an electrically-operated sealed compressor

Abstract

A gear pump is used in an electrically-operated sealed compressor. The compressor includes a compression mechanism, an electric motor for driving the compression mechanism, and a crankshaft for transmitting the rotational force of the electric motor to the compression mechanism. The gear pump includes a pair of gears being in mesh with each other, one of which is connected to one end of the crankshaft, and a pump casing accommodating only the pair of gears. The pump casing together with the gear pair is disposed on one side of a cover plate, while other elements constituting the gear pump are disposed on the other side of the cover plate. By this construction, the distance between the gear pair and an auxiliary bearing to which the gear pump is secured can be reduced and, hence, an undesirable whirling of one end portion of the crankshaft can also be reduced.

What is claimed is: 
     
       1. A gear pump for use in an electrically-operated sealed horizontal compressor including a compression mechanism, an electric motor for driving the compression mechanism, and a crankshaft for transmitting a rotational force of the electric motor to the compression mechanism, said gear pump comprising: a first gear connected to an end of the compressor crankshaft;   a second gear in mesh with said first gear;   an oil suction nozzle having a lower end and an upper end opposite said lower end for introducing oil to said first gear and said second gear;   a cover plate for covering said first gear and said second gear;   a foreign substance storage portion, wherein said foreign substance storage portion is defined as a portion for storing foreign substances therein; a pump cover mounted on said cover plate, wherein said foreign substance storage portion is provided in said pump cover; and   a strainer interposed between said foreign substance storage portion and said cover plate for capturing foreign substances contained in the oil introduced by said oil suction nozzle;   wherein said foreign substance storage portion is provided such that said cover plate is interposed between said foreign substance storage portion and said first and second gear; and   wherein said upper end of said oil suction nozzle is located at said foreign substance storage portion.   
     
     
       2. The gear pump of claim 1, further comprising a permanent magnet mounted in said pump cover. 
     
     
       3. The gear pump of claim 1, wherein said foreign substance storage portion comprises a recess in said pump cover for accumulating foreign substances. 
     
     
       4. A gear pump for use in an electrically-operated sealed horizontal compressor including a compression mechanism, an electric motor for driving the compression mechanism, and a crankshaft for transmitting a rotational force of the electric motor to the compression mechanism, said gear pump comprising: a first gear connected to an end of the compressor crankshaft;   a second gear in mesh with said first gear;   a strainer for capturing foreign substances contained in oil introduced to said first gear and said second gear;   a cover plate for covering said first gear and said second gear;   a pump cover mounted on said cover plate;   an oil suction nozzle having a lower end and an upper end opposite said lower end, said upper end being secured to said pump cover such that said cover plate is interposed between said oil suction nozzle and said first and second gear; and   an oil storage portion formed by said cover plate and said pump cover; said strainer located in said oil storage portion;   wherein said upper end of said oil suction nozzle is located at said oil storage portion.   
     
     
       5. The gear pump of claim 4, wherein said pump cover further includes a foreign substance storage portion for storing foreign substances, said cover plate being interposed between said foreign substance storage portion of said pump cover and said first and second gear.